Functionalization of cellulose carbon dots with different elements(N,B and S)for mercury ion detection and anti-counterfeit applications  

作　　者：Xiaoning Li Quanyu Shi Meng Li Ningxin Song Yumeng Xiao Huining Xiao Tony D.James Lei Feng 

机构地区：[1]Second Affiliated Hospital of Dalian Medical University,Dalian 116023,China [2]Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control,Department of Environmental Science and Engineering,North China Electric Power University,Baoding 071003,China [3]Department of Chemical Engineering and Limerick Pulp&Paper Centre,University of New Brunswick,15 Dineen Drive,Fredericton NB E3B 5A3,Canada [4]Department of Chemistry,University of Bath,Bath BA27AY,United Kingdom [5]School of Chemistry and Chemical Engineering,Henan Normal University,Xinxiang 453007,China

出　　处：《Chinese Chemical Letters》2024年第7期355-359,共5页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52370110 and 21607044);supported by the Fundamental Research Funds for the Central Universities(No.2023MS146);the Open Research Fund of the School of Chemistry and Chemical Engineering,Henan Normal University for support(Nos.2020ZD01 and 2021YB07)。

摘　　要：Mercury ion(Hg^(2+)),as one of the most toxic heavy metal ions,accumulates easily in the environment,which can generate potential hazards to the ecosystem and human health.To effectively detect and remove Hg^(2+),we fabricated four types of carbon dots(CDs)using carboxymethyl nanocellulose as a carbon source doped with different elements using a hydrothermal method.All the CDs exhibited a strong fluorescence emission,excitation-dependent emission and possessed good water dispersibility.Moreover,the four fluorescent CDs were used for Hg^(2+)recognition in aqueous solution,where the CDs-N exhibited better sensitivity and selectivity for Hg^(2+)detection,with a low limit of detection of 8.29×10^(-6)mol/L.It was determined that the fluorescence quenching could be ascribed to a photoinduced charge-transfer processes between Hg^(2+)and the CDs.In addition,the CDs-N were used as a smart invisible ink for anticounterfeiting,information encryption and decryption.Furthermore,the CDs-N were immersed into a cellulose(CMC)-based hydrogel network to prepare fluorescent hydrogels capable of simultaneously detecting and adsorbing Hg^(2+).We anticipate that this research will open possibilities for a green method to synthesize fluorescent CDs for metal ion detection and fluorescent ink production.

关 键 词：Carbon dots Functional groups Hg^(2+)detection Mechanism ANTI-COUNTERFEITING 

分 类 号：O657.3[理学—分析化学] X832[理学—化学]